Optimistic protocols for fair exchange
Proceedings of the 4th ACM conference on Computer and communications security
Efficient verifiable encryption (and fair exchange) of digital signatures
CCS '99 Proceedings of the 6th ACM conference on Computer and communications security
Evolution of Fair Non-repudiation with TTP
ACISP '99 Proceedings of the 4th Australasian Conference on Information Security and Privacy
Stateless-Recipient Certified E-Mail System Based on Verifiable Encryption
CT-RSA '02 Proceedings of the The Cryptographer's Track at the RSA Conference on Topics in Cryptology
ESORICS '96 Proceedings of the 4th European Symposium on Research in Computer Security: Computer Security
A Practical Public Key Cryptosystem Provably Secure Against Adaptive Chosen Ciphertext Attack
CRYPTO '98 Proceedings of the 18th Annual International Cryptology Conference on Advances in Cryptology
Selective Receipt in Certified E-mail
INDOCRYPT '01 Proceedings of the Second International Conference on Cryptology in India: Progress in Cryptology
A Certified E-mail System with Receiver's Selective Usage of Delivery Authority
INDOCRYPT '02 Proceedings of the Third International Conference on Cryptology: Progress in Cryptology
An Optimistic Non-repudiation Protocol with Transparent Trusted Third Party
ISC '01 Proceedings of the 4th International Conference on Information Security
An Efficient Non-repudiation Protocol
CSFW '97 Proceedings of the 10th IEEE workshop on Computer Security Foundations
Simple and fast optimistic protocols for fair electronic exchange
Proceedings of the twenty-second annual symposium on Principles of distributed computing
An intensive survey of fair non-repudiation protocols
Computer Communications
Optimistic fair exchange of digital signatures
IEEE Journal on Selected Areas in Communications
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As a value-added service for standard email systems, a certified email scheme allows a sender to deliver a message to a receiver in a fair way in the sense that either the sender obtains a receipt from the receiver and the receiver accesses the content of the email simultaneously, or neither party gets the expected item. In this paper, we first point out some weaknesses in several existing schemes. Then, we present two generic optimistic certified email schemes with transparent TTP. Our schemes are not only fair, but also support timeliness in two flavors: one scheme supports weak timeliness but with stateless TTP, while the other guarantees (strong) timeliness though only supports weak stateless TTP. Technical discussion and comparison are provide to show that our schemes are both secure and efficient, compared with the-state-of-art in this field.